Last updated: February 24, 2025
In Pasadena, United States, May showcases a delightful shift into warmer weather, with maximum temperatures soaring to 34°C (94°F) and an average of 18°C (64°F). While evenings can be cool with a minimum dipping down to 6°C (43°F), the month remains predominantly pleasant. Although precipitation is modest, totaling 16 mm (0.6 in) over 3 days, humidity levels average around 57%, giving a refreshing feel to the air. Overall, May paints a vibrant picture, perfect for outdoor activities and enjoying the blooming surroundings.
In Pasadena, May marks a delightful transition into warmer days, with temperatures reflecting a pleasant climb. The month begins with a minimum of 6°C (43°F) and an average temperature of 18°C (64°F), which sets a comfortable stage for outdoor activities. As sunshine takes the lead, the highs can soar to 34°C (94°F), mirroring the peak warmth experienced in the preceding month of April. This pattern not only hints at the arrival of summer but also showcases a consistent upward trend in temperatures as the year unfolds. With a mix of mild and warmer days, May offers a tantalizing taste of the heat to come, inviting residents and visitors alike to enjoy the blooming season in this vibrant city.
In Pasadena, May marks a significant dip in precipitation, with only 16 mm (0.6 in) of rain falling across just 3 days. This trend of diminishing rainfall continues from April's meager 22 mm (0.9 in), suggesting a gradual transition into the dry summer months. The contrast is stark when compared to the wetter early months of the year, such as March, which experiences 85 mm (3.4 in) over 10 days. As the region approaches June, the likelihood of rain drops dramatically, highlighting a pattern of increasingly arid conditions that define the southern California climate, making May a clear precursor to the largely dry weeks ahead.
As spring blooms in Pasadena, May ushers in a refreshing dip in humidity, dropping to 57%. This marks a notable shift from the wetter months of January and February, where humidity levels hover above 80%. Transitioning into the warmer months, the air grows increasingly drier, with June and July showcasing even lower humidity levels at 52% and 46%, respectively. This gradual decline emphasizes a distinct trend as Pasadena moves towards summer, creating a comfortable atmosphere perfect for outdoor activities. By the time August rolls around, the city reaches its peak dryness at just 39%, highlighting the contrast between the lush, humid springtime and the arid summer ahead.
As May rolls into Pasadena, the UV Index reaches a peak of 11, placing it in the extreme exposure category. This significant jump from the moderate levels of January to very high levels through the spring months signals a marked increase in sun intensity, with a burn time of just 10 minutes for unprotected skin. After a month of 10 in April, May’s fierce UV rays serve as a reminder to prioritize sun safety. The trend indicates that residents should be extra vigilant as the sun becomes more potent, continuing into June. So whether you’re lounging by the pool or hiking the trails, be sure to equip yourself with adequate sun protection. For more detailed insights, check out the Pasadena UV Index.
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In Pasadena, the delightful arrival of May heralds the peak of sunshine, with 356 hours of radiant light gracing the city. This month is a stunning progression from the 185 hours seen in January, showcasing a remarkable surge as spring fully blooms. As the days lengthen, May stands in splendid contrast to the mellow glow of November's 255 hours, illustrating the vibrant energy of early summer. Following this upward trajectory, June and July experience even more sunlight, but May remains a standout, marking a key transition into the sun-drenched days of summer, where outdoor adventures and community gatherings abound.
As we transition into May, Pasadena delights in a 72% chance of sunny weather, marking a slight uptick from April's 59%. This month sits comfortably within the sunny spectrum, indicating a trend of increasing sunshine as we move deeper into spring. Following May, the probabilities steadily rise, with June reaching 80% and peaking in August and September at 82% and 85%, respectively. This pattern showcases Pasadena's characteristic warmth and brightness as summer approaches, making May an ideal time for outdoor activities and soaking up those rays.
As spring transitions into summer, Pasadena experiences a pleasant increase in daylight duration that enhances outdoor activities and community gatherings. In May, the city enjoys about 13 hours of daylight, maintaining the same generous hours as in April. This trend continues into June and July, where daylight peaks at 14 hours, allowing residents to bask in the sun as the days grow longer. The gradual decline begins in August, where the duration drops back to 13 hours, paving the way for the shorter days of fall. Overall, May serves as a vital link in Pasadena's daylight evolution, embodying the vibrant energy of spring while hinting at the sunny days that lie ahead.
In Pasadena during the month of May, the average wind speed dips to a gentle 1.9 m/s (4 mph), marking a slight decrease from the previous months. This trend of gradually diminishing winds continues through the summer, reaching a low of 1.8 m/s (4 mph) from June to August. Interestingly, the autumn months bring a subtle revival in speed, with October and November both returning to 2.0 m/s (4 mph). Overall, the data reveals a tendency towards calmer breezes as spring transitions into summer, inviting a serene atmosphere perfect for outdoor activities while reminding us that even the lightest winds contribute to the area's unique charm.
The weather in Pasadena changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of May's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Pasadena and find detailed weather information for every month.
May offers a warmer climate compared to January, with average temperatures ranging from a cool 6°C (43°F) to a hot 34°C (94°F), while January sees milder conditions, with temperatures spanning from 0°C (32°F) to 29°C (84°F). Precipitation in May is relatively low at 16 mm (0.6 in) over just three days, whereas January experiences significantly more rainfall at 75 mm (3.0 in) over five days, contributing to higher humidity levels of 78%. This increased humidity in January, compared to May's 57%, gives the winter month a distinct chill despite its moderate temperatures. For more detailed information, you can check out Pasadena weather in January.
When comparing the weather in May and February, it's clear that May brings warmer temperatures and less precipitation. In May, temperatures range from a minimum of 6°C (43°F) to a maximum of 34°C (94°F), with an average of 18°C (64°F) and only 16 mm (0.6 in) of rain over about 3 days. Conversely, February experiences cooler temperatures, ranging from a minimum of 0°C (31°F) to a maximum of 28°C (83°F), with an average of 12°C (54°F). This month also sees significantly higher precipitation, totaling 65 mm (2.6 in) over approximately 6 days, and a higher humidity level of 82%. For more detailed insights, you can check Pasadena weather in February.
When comparing the weather in March and May, notable differences emerge. March experiences cooler temperatures with a minimum of 1°C (34°F) and an average of 13°C (56°F), while May boasts significantly warmer conditions, with a minimum of 6°C (43°F) and an average of 18°C (64°F). Additionally, March is marked by higher precipitation, totaling 85 mm (3.4 in) over about 10 days, compared to May's much drier climate with only 16 mm (0.6 in) across just 3 days. Humidity levels also vary, with March averaging 75% versus May's 57%. For a more detailed look at March conditions, you can refer to Pasadena weather in March.
In comparing the weather of April and May, we see some interesting similarities and differences. Both months feature a minimum temperature of 6°C (43°F) and a maximum that can reach up to 34°C (94°F), showcasing warm conditions. However, May boasts a slightly higher average temperature of 18°C (64°F) compared to April's 17°C (62°F). While May experiences less precipitation at 16 mm (0.6 in) over 3 days, April has a bit more rain with 22 mm (0.9 in) over just 2 days. Additionally, April's humidity is higher at 68%, compared to May's 57%. For a deeper look into April's weather specifics, you can check out Pasadena weather in April.
May and June exhibit distinct weather patterns, with June generally offering warmer temperatures and drier conditions. In May, temperatures range from a minimum of 6°C (43°F) to a maximum of 34°C (94°F), with an average of 18°C (64°F) and 16 mm (0.6 in) of precipitation over 3 days. This month features a humidity level of 57%, creating a mild and somewhat humid atmosphere. In contrast, June experiences higher temperatures, with minimums around 11°C (51°F) and maximums soaring to 40°C (105°F), while averaging 22°C (71°F). Notably, June sees very little rain, with only 1 mm (0.1 in) of precipitation over 0 days, leading to a drier experience overall, complemented by a lower humidity of 52%. For more detailed information, you can visit Pasadena weather in June.
May and July exhibit contrasting weather patterns, reflecting a transition from spring to summer. In May, temperatures range from a cool 6°C (43°F) at night to a warm 34°C (94°F) during the day, with an average temperature of 18°C (64°F). The month sees about 16 mm (0.6 in) of precipitation over three days, contributing to a humidity level of 57%.
In contrast, July offers significantly warmer temperatures, with a minimum of 13°C (57°F) and a maximum soaring to 43°C (109°F), resulting in an average of 25°C (77°F). This month is much drier, receiving only 2 mm (0.1 in) of precipitation and no rainy days, leading to a lower humidity of 46%. For a detailed overview of July conditions, you can check Pasadena weather in July.
In May, temperatures can vary significantly, ranging from a chilly minimum of 6°C (43°F) to a warm maximum of 34°C (94°F), with an average temperature of 18°C (64°F). The month sees a moderate amount of precipitation at 16 mm (0.6 in) over three days, contributing to a humidity level of 57%. In contrast, August presents much warmer conditions, with a minimum temperature of 15°C (59°F) and a much higher average of 25°C (78°F), peaking at a scorching 40°C (105°F). Precipitation is virtually nonexistent in August, with just 2 mm (0.1 in) and no rainy days, leading to a drier atmosphere with lower humidity of 39%. For a more detailed overview, you can check Pasadena weather in August.
In comparing the weather between May and September, we notice some distinct differences. May experiences a wider range of temperatures, with a minimum of 6°C (43°F) and a maximum reaching up to 34°C (94°F), averaging around 18°C (64°F). It also sees more precipitation, totaling 16 mm (0.6 in) over about 3 days, coupled with a higher humidity level of 57%. In contrast, September boasts a warmer climate with a minimum temperature of 10°C (51°F) and a striking maximum of 44°C (112°F), averaging 23°C (74°F). Notably, September is much drier, receiving only 4 mm (0.1 in) of precipitation over 0 days and lower humidity at 48%. For more details on September weather, visit Pasadena weather in September.
May and October present distinct weather patterns, though both feature similar minimum temperatures around 6-7°C (43-44°F). In May, the average temperature is slightly lower at 18°C (64°F) compared to October's 20°C (68°F), while October can see higher maximums, reaching up to 38°C (101°F). Precipitation is minimal in both months, with May experiencing 16 mm (0.6 in) over three days, whereas October has only 9 mm (0.4 in) across just one day. Humidity levels remain quite similar, with May at 57% and October slightly higher at 59%. For more detailed information, you can visit Pasadena weather in October.
May and November both showcase a range of pleasant temperatures, but their specific climatic characteristics differ. In May, the temperatures vary significantly, with a minimum of 6°C (43°F), an average of 18°C (64°F), and a maximum of 34°C (94°F), accompanied by relatively low precipitation of 16 mm (0.6 in) over just three days and a humidity level of 57%. In contrast, November experiences slightly cooler temperatures, with a minimum of 2°C (37°F), an average of 16°C (61°F), and a maximum of 31°C (89°F). Additionally, November sees increased precipitation of 24 mm (0.9 in) over two days, coupled with higher humidity at 72%. For a detailed look at November's weather, you can check Pasadena weather in November.
May and December showcase contrasting weather patterns. In May, temperatures generally range from a pleasant 18°C (64°F) on average, with highs reaching up to 34°C (94°F), making it a warm and relatively dry month with only 16 mm (0.6 in) of precipitation over about three days. In contrast, December experiences cooler temperatures, averaging 12°C (53°F) with maximums around 27°C (81°F), accompanied by significantly higher precipitation of 77 mm (3.1 in) spread over five days, and increased humidity at 76%. For more detailed insights on December weather, check Pasadena weather in December.
As Pasadena transitions into May, the weather becomes notably warmer and more inviting compared to the cooler months preceding it. The city experiences a pleasant average temperature that sits comfortably between the extremes, making it perfect for outdoor activities. While the likelihood of precipitation remains low with only a few rainy days, the humidity adds a touch of mildness to the warm temperatures. This month exudes a vibrant charm, setting the stage for summer adventures ahead. For a deeper dive into the weather patterns throughout the year, check out Pasadena Climate.